干旱区生态环境知识资源中心(Arid): Exploring the relationship between SPI and SPEI in a warming world

Arid

DOI	10.1007/s00704-023-04764-y
	Exploring the relationship between SPI and SPEI in a warming world
	Nwayor, Isioma Jessica; Robeson, Scott M.
通讯作者	Nwayor, IJ
来源期刊	THEORETICAL AND APPLIED CLIMATOLOGY
ISSN	0177-798X
EISSN	1434-4483
出版年	2024
卷号	155 期号:4 页码:2559-2569
英文摘要	Over the last 50 years, global air temperature has increased substantially especially over continents, causing higher rates of evaporative demand that can lead to an increase in drought occurrence and intensity worldwide. The Standardized Precipitation Index (SPI) is a drought index that solely uses precipitation, while the Standardized Precipitation Evapotranspiration Index (SPEI) uses the difference between precipitation and potential evapotranspiration and, therefore, incorporates the impacts of warming more directly. Here, we explore trends in SPI and SPEI, the relationship between SPI and SPEI, and how this relationship varies across different climate types. We find that a majority of the terrestrial surface has positive trends in SPI while most has negative SPEI from 1971 to 2022, a period of consistent global warming. Although the two indices show positive correlation with each other across the globe, we find decreasing correlation across all aridity types from the humid to the hyper-arid regions. The difference of correlation across two recent 26-year periods indicates that humid regions have consistent correlations through time while arid regions experience substantial interdecadal variation. Using a spatially weighted multiple linear regression, we find that SPI and SPEI trends have opposing relationships with temperature trends; specifically, it has a direct relationship with SPI trends and an inverse relationship with SPEI trends. In contrast, both vapor-pressure deficit and incoming solar radiation have an inverse relationship with SPI and a stronger inverse relationship with SPEI. Ongoing increases in temperature and vapor-pressure deficit are likely to cause further decoupling of the two indices worldwide.
英文关键词	SPI and SPEI relationship Aridity index climate types Drought
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001123895600001
WOS关键词	SOLAR-RADIATION ; DROUGHT INDEXES ; PRECIPITATION ; CLIMATE ; TRENDS ; EVAPOTRANSPIRATION ; VARIABILITY ; CHINA ; TEMPERATURE ; DATASETS
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405782
推荐引用方式 GB/T 7714	Nwayor, Isioma Jessica,Robeson, Scott M.. Exploring the relationship between SPI and SPEI in a warming world[J],2024,155(4):2559-2569.
APA	Nwayor, Isioma Jessica,&Robeson, Scott M..(2024).Exploring the relationship between SPI and SPEI in a warming world.THEORETICAL AND APPLIED CLIMATOLOGY,155(4),2559-2569.
MLA	Nwayor, Isioma Jessica,et al."Exploring the relationship between SPI and SPEI in a warming world".THEORETICAL AND APPLIED CLIMATOLOGY 155.4(2024):2559-2569.